80878209 has 4 divisors (see below), whose sum is σ = 107837616. Its totient is φ = 53918804.

The previous prime is 80878207. The next prime is 80878219. The reversal of 80878209 is 90287808.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80878209 - 2¹ = 80878207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80878201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13479699 + ... + 13479704.

It is an arithmetic number, because the mean of its divisors is an integer number (26959404).

Almost surely, 2^80878209 is an apocalyptic number.

It is an amenable number.

80878209 is a deficient number, since it is larger than the sum of its proper divisors (26959407).

80878209 is a wasteful number, since it uses less digits than its factorization.

80878209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26959406.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 80878209 is about 8993.2312880299. The cubic root of 80878209 is about 432.4579067368.

The spelling of 80878209 in words is "eighty million, eight hundred seventy-eight thousand, two hundred nine".